Anyone running a th400 in their a body?

I agree 100%. Converter selection is another issue. Protrans can change the input shaft and front pump assembly to accept a TH400 converter but no one has tried it on a high hp car. I may be the first. The conversation always goes to the 727 not being able to handle the torque, but the diesel guys use em on way more torque than I will ever have. It also goes to the exploding torqueflite issue but thats operator error mixed with a weak spot in the 727. If you look at the TH400 vs 727 you will notice that the 727 has more clutch area and larger planetary gears.
I have not expanded enough yet to get into a TH400. But I plan to in the future. I’m happy to hear you are gonna try pro trans TH400 input shaft conversion. Will be interesting to hear your outcome on that.